JP2008036267A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine which has an agitating blade fixed to a washing shaft with a fixing screw, and prevents the agitating blade from being removed from the washing shaft due to loosing of the fixing screw even when the washing machine has a large capacity and is therefore highly reliable, and which can be made inexpensive by reducing the number of components and assembly man-hour. <P>SOLUTION: A male thread part 16a is formed at the outer circumference of the end of the washing shaft 16, and a female thread part 14a is formed through the inner circumferential surface of a separate member 14. They are fastened with each other by fitting screws, and the fixing screw 15 is made to abut on the end 16c of the washing shaft 16 by its step part 15a. Thus, even when the capacity is large, the fixing screw 15 is not loosened and the agitating blade 13 is not removed from the washing shaft 16, the reliability is therefore improved. Moreover, the costs are reduced by reducing the number of components and the assembly man-hour. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a washing machine in which a stirring blade is fixed to a washing shaft with a screw.

  Conventionally, this type of first conventional washing machine is configured as shown in FIGS. Hereinafter, the configuration will be described.

  As shown in the sectional view of the washing machine of the conventional example in FIG. 3, the washing machine body 1 is provided with a water receiving tub 3 suspended by a suspension 2 so as to prevent dehydration vibrations in the interior thereof. A washing / dehydrating tub 4 is rotatably disposed in the interior 3, and an agitating blade 5 made of synthetic resin or the like for stirring the laundry is rotatably disposed on the inner bottom of the washing / dehydrating tub 4. .

  As shown in the cross-sectional view of the main part of FIG. 4, the stirring blade 5 has a female screw portion formed at the center of the washing shaft 6 by a male screw portion 8 b of the fixing screw 8 with a separate member 7 between the stirring blade 5 and the washing shaft 6. 6b is fixed by screw fitting. The outer periphery of the front end portion of the washing shaft 6 has a tooth shape 6a such as serration processing, and the tooth shape portion 7a formed at the central inner diameter portion of the separate member 7 as shown in the top view and the sectional view of the separate member of FIG. In addition, the outer diameter of the separate member 7 also forms a tooth shape 7b, is fitted with the tooth shape portion 9 formed at the center of the stirring blade 5, and has a slight gap from the upper end of the washing shaft 6. It has a horizontal surface 7c.

  As shown in the side view and the bottom view of the screw in FIG. 6, the contact surface of the fixing screw 8 with the stirring blade 5 is provided with a plurality of radial projections 8a, and the fixing screw 8 in FIG. As shown in the exploded side view of the main part, the protrusion 8a is engaged with a dish-like toothed washer 10 for preventing loosening and brought into contact with the dish-like contact surface 12 of the stirring blade 5 in FIG. The frictional force prevents loosening.

  As a method different from the method in which the toothed washer 10 is configured to prevent loosening on the contact surface between the fixing screw 8 and the stirring blade 5 made of synthetic resin described in the first conventional example, A second conventional washing machine having the configuration shown in FIGS. 8 to 9 has been proposed.

  In the main part sectional view of FIG. 8 and the partial sectional main part exploded side view of FIG. 9, the stirring blade 13 is fixed to the washing shaft 6 by a screw 25 through another member 24 formed of metal. The front end portion of the washing shaft 6 is fitted with a tooth shape portion 24 a formed as a tooth shape 6 a in the center of the separate member 24.

  The screws 25 are in contact with the separate member 24 formed of the metal. The protrusions 25a are provided radially on the contact surface, and when the screws 25 are tightened, the protrusions 25a come into contact with the separate member 24. By preventing the surface 24b from entering, it is prevented from loosening (see, for example, Patent Document 1).

As shown in FIG. 9, the separate member 24 has an abutment surface 24 b formed on the upper portion thereof, so that the upper end portion of the configuration of the tooth profile portion 24 a is formed in a bag shape.
JP 2001-259278 A

  In such a configuration of the first conventional example, the torque of the motor increases as the capacity increases, and a large load is applied to the stirring blade 5 for stirring the laundry, and the fixing screw 8 and the toothed washer 10 are added. Since the abutment surface 12 of the stirring blade 5 that is engaged with and abuts is made of synthetic resin, it is scraped off by the toothed washer 10, and the effect of preventing the locking screw 8 from being loosened is lost. There was a problem that the screw 8 was loosened and the stirring blade 5 was detached from the washing shaft 6.

  When the fixing screw 8 is loosened, the separate member 7 shown in FIG. 5 has a tooth profile of the washing shaft 6 fitted to the tooth profile portion 7a formed in the center due to the stress generated when the stirring blade 5 is reversed left and right. Between the shape 6a, rattling occurs, and the tooth shape shape 7b of the outer diameter portion of the separate member 7 and the tooth shape shape portion 9 formed at the center of the stirring blade 5 and play also occur. There was a problem. In addition, the number of parts, the number of assembly steps increased, and the cost increased.

  Further, in the configuration of the second conventional example, the effect of preventing the screw from loosening is improved as compared with the first conventional example, but the tooth profile 6a at the tip of the washing shaft 6 and the tooth profile 24a of the separate member 24 The fitting state becomes a problem.

  That is, the tooth profile shape 6a formed on the upper end portion of the washing shaft 6 such as serration is processed by machining or the like, and thus the external dimensions of the tooth profile shape are formed in a straight line with little change during processing. That is, there is no difference in the external dimensions between the root A portion of the tooth profile 6a and the B portion of the tip.

  On the other hand, since the processing of the tooth profile portion 24a of the separate member 24 made of metal constitutes the contact surface 24b that contacts the screw 25 in the separate member 24, the inner diameter portion has a bag shape on the upper surface. Machining is difficult, and die casting or forging with aluminum or zinc is generally employed.

  In this case, in the dimension of the tooth profile portion 24a, a dimensional difference occurs between the opening C and the upper end D at the back due to the draft angle of the mold, and the C is larger than the D. Therefore, the washing shaft 6 and the separate member 24 are fitted in the circumferential direction between the A portion and the C portion even if the washing shaft B portion and the D portion of the separate member 24 are closely fitted without a gap. Cause minute gaps and rattling.

  As a result, the torque of the motor increases with the increase in capacity, and when a large load is repeatedly applied by the stirring blade, loosening occurs from the fitting part of this washing shaft and another member, which causes loosening of the screw. become.

  The present invention solves the above-mentioned conventional problems. Even when the capacity becomes large, the stirring blade does not come off the washing shaft without loosening the screw, thereby improving the reliability and reducing the number of parts and the number of assembly steps. The purpose is to reduce costs.

  In order to solve the conventional problem, the washing machine of the present invention fixes the stirring blade to the washing shaft with a fixing screw via a separate member between the washing shaft for rotating the stirring blade and the stirring blade. A male screw portion is provided on the outer periphery of the front end of the washing shaft, and an inner peripheral surface of the separate member is provided with a penetrating female screw portion, which are fastened by screw fitting, and the stepped portion of the fixed screw is connected to the front end of the washing shaft. It is made to contact the part.

  As a result, even if the capacity becomes large, the agitation blade can be prevented from being detached from the washing shaft without loosening the fixing screw, and the reliability can be improved, and the number of parts and the number of assembling steps can be reduced, thereby reducing the cost. be able to.

  In the washing machine of the present invention, even if a large load is applied to the stirring blade that stirs the laundry due to an increase in the torque of the motor accompanying an increase in capacity, the stirring blade comes off the washing shaft without loosening the fixing screw. Therefore, the reliability can be improved and the toothed washer is not required, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

  1st invention consists of a stirring blade rotatably disposed in a washing and dewatering tub, a washing shaft for rotating the stirring blade, and another member made of a metal material between the washing shaft and the stirring blade. And a stepped fixing screw that is screw-fitted to a female screw formed at the inner diameter portion of the washing shaft tip, a female screw portion is formed on the outer periphery of the tip of the washing shaft, and the inner circumferential surface of the separate member penetrates the female screw The fixing screws are screwed together and fastened, and the fixing screw has its stepped portion in contact with the tip of the washing shaft, and even if the capacity becomes large, the fixing screw does not loosen The wings can be prevented from being detached from the washing shaft, so that the reliability can be improved, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of the washing machine according to the first embodiment of the present invention, and FIG. 2 is an exploded view of a main part of the washing machine.

  As shown in FIG. 1, the stirring blade 13 is rotatably disposed on the inner bottom of the washing and dewatering tub 4 and stirs the laundry. The stirring screw 13 is fixed to the fixing screw through another member 14 made of a metal material. It is configured to be fixed by screw fitting to a female screw 16b formed on the inner diameter portion of the tip end of the washing shaft 16 by 15 male screw portions 15b.

  The outer periphery of the front end portion of the washing shaft 16 constitutes a male screw portion 16a and, as shown in FIG. 2, is screwed into a female screw portion 14a formed so as to penetrate the central inner diameter portion of the different member 14, thereby providing another member. 14 is fastened to the washing shaft 16.

  Further, the outer diameter of the separate member 14 forms a tooth profile shape 14b by processing such as spline or serration, and a tooth profile portion 17 corresponding to the tooth profile shape 14b is formed at the center of the stirring blade 13, and the tooth profile profile 14b. The other member 14 and the stirring blade 13 are fixed to each other by press-fitting the tooth shape portion 17.

  The assembly order is as follows. First, the separate member 14 and the washing shaft 16 are screwed and fastened with the female screw portion 14a and the male screw portion 16a, and then the stirring blade 13 is press-fitted into the separate member 14 from above, and the fixing screw 15 is further inserted. Then, the stirring blade 13 is fixed to the washing shaft 16 via the separate member 14.

  Alternatively, in the case of assembly at the time of disassembly service or the like, the separate member 14 is press-fitted into the stirring blade 13 in advance, and the separate member 14 and the washing shaft 16 are screw-fitted while rotating the stirring blade 13, and the fixing screw 15 is attached. May be concluded.

  Further, since the female screw portion 14a of the separate member 14 is formed so as to penetrate therethrough, the step portion 15a of the fixing screw 15 is fastened so as to come into contact with the tip portion 16c of the washing shaft 16 in FIG. Further, an O-ring 18 is provided on the head side of the fixing screw 15.

  About the washing machine comprised as mentioned above, the operation | movement and a structure are demonstrated below.

  In order to attach the stirring blade 13 to the washing shaft 16, another member 14 press-fitted to the stirring blade 13 constitutes a female screw portion 14a penetrating in the center, and is screwed to the washing shaft 16 having the male screw portion 16a. Fastened together, and then fixed with the fixing screw 15.

  In this case, since the fixing screw 15 is fastened in contact with the distal end portion 16c of the washing shaft 16, the fixing screw 15 is fixed so as to move in synchronization with the washing shaft 16 irrespective of the reversing operation during washing. The screw 15 does not loosen. For this reason, as the capacity increases, the torque of the motor increases, and even when a large load is applied to the stirring blade 13 that stirs the laundry, the fixing screw 15 is loosened and the stirring blade 13 is detached from the washing shaft 16. There is no fear.

  In addition, since the separate member 14 press-fitted to the stirring blade 13 and the washing shaft 16 are fastened by screw fitting, the processing is simple and the fitting accuracy of both the parts can be increased. The occurrence of wear due to sag is eliminated, and the washer with the locking tooth used in the first conventional example is not required, so that the number of parts and the number of assembling steps can be reduced and the cost can be reduced. Further, in this embodiment, since the minute gap between the washing shaft and the separate member which has occurred in the second conventional example is eliminated, there is no risk of loosening of the screw due to rattling. In particular, it is possible to cope with the torsional torque from the stirring blade 13 at a portion where the outer diameter of the washing shaft 16 is small.

  As described above, the washing machine according to the present invention can reliably prevent the stirring blade from coming off the washing shaft without loosening the screw even when a large load is applied to the stirring blade for stirring the laundry. Therefore, the present invention is useful as a washing machine or the like in which the torque of the motor is increased as the washing capacity is increased.

Sectional drawing of the principal part of the washing machine in Embodiment 1 of this invention Partial sectional view of the washing machine Sectional view of the washing machine of the first conventional example Cross section of the main part of the washing machine (A) Top view of another member of the washing machine, (b) Cross-sectional view of another member of the washing machine (A) Side view of screw of the washing machine, (b) Bottom view of screw of the washing machine Exploded side view of the main part of the fixing screw of the washing machine Sectional drawing of the principal part of the washing machine of the second conventional example Partial sectional view of the washing machine

Explanation of symbols

4 Washing and Dewatering Tank 13 Stirring Blade 14 Separate Member 14a Female Screw Part 15 Fixing Screw 15a Stepped Part 16 Washing Shaft 16a Male Screw Part 16b Female Screw 16c Tip

Claims (1)

A stirring blade rotatably disposed in the washing and dewatering tub; a washing shaft for rotating the stirring blade; a separate member made of a metal material between the washing shaft and the stirring blade; A stepped fixing screw that is screw-fitted to a female screw formed on the inner diameter part of the tip, forming a male screw part on the outer periphery of the tip of the washing shaft, and forming an internal thread part penetrating the inner peripheral surface of the separate member; Each of them is fastened by screw fitting, and the fixing screw has a stepped portion abutting against the tip of the washing shaft.

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